/*
 * yauosk - Yet Another Useless Operating System Kernel
 *
 * Copyright (c) 2009-2010 Matteo Cicuttin
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <systm.h>
#include <arch/x86/machine.h>

#define KBD_DATA		0x60
#define KBD_STATUS		0x64
#define KBD_HAS_DATA	0x01

static void (*atkbdc_kb_callback)(char);
static void atkbdc_intr(void);

void
atkbdc_init(void)
{
	atkbdc_kb_callback = NULL;
	irq_install_handler(IRQ_KEYBOARD, &atkbdc_intr);
	irq_8259_enable(IRQ_KEYBOARD);
	ioapic_intr_enable(IRQ_KEYBOARD, 1);
	printf("atkbdc: Keyboard controller driver loaded\n");
}

void
atkbdc_register_callback(void (*kbcb)(char))
{
	if (atkbdc_kb_callback != NULL)
	{
		printf("Keyboard callback already registered, check your code\n");
		return;
	}
	atkbdc_kb_callback = kbcb;
}

void
atkbdc_remove_callback(void)
{
	atkbdc_kb_callback = NULL;
}

static void
atkbdc_intr(void)
{
	uchar kbd_data;
	uchar kbd_status;
	
	kbd_status = inb(KBD_STATUS);
	if ( !(kbd_status & KBD_HAS_DATA) )
		return;
	kbd_data = inb(KBD_DATA);
	
	if (atkbdc_kb_callback)
		atkbdc_kb_callback(kbd_data);
	
	printf("kbd intr: %x (%c)\n", kbd_data, kbd_getc());
}